how to understand pkgconfig Requires: fields ?

[Drew Parsons]

On Sun, 2006-04-30 at 15:36 +0300, Daniel Stone wrote:
> On Sun, Apr 30, 2006 at 10:24:28PM +1000, Drew Parsons wrote:
> > I'd like to ask someone to clarifies the Requires fields in the
> > pkgconfig .pc files.
> > Allow me to use lib/XprintUtil as an example.  Its pc file (see
> > http://webcvs.freedesktop.org/xorg/lib/XprintUtil/xprintutil.pc.in?view=markup) has:
> > 
> > Requires: x11 xt printproto
> > Requires.private: x11 xp xt
> > 
> > What is the difference between Requires: and Requires.private:?
> > 
> > xp is the odd one out, needed only in .private. At which point does it need to be installed?
> 
> .private is required for static linking.

OK.  I'm not familiar with pkgconfig dependencies.  What is being
checked at build exactly? Does that mean Requires: need to be already
installed at build time, while Requires.private: need only be installed
for runtime (unless a static build is desired) ?

Drew